<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript操作符-算术运算符</title>
</head>

<body>
    <p id="demo"></p>
    <script>
        //JavaScript使用 算术运算符 来计算值:
        document.getElementById("demo").innerHTML = (5 + 6) * 10;   //110
    </script>
</body>

</html>